User manual

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance Objects
3-233ATM-TRK (Circuit Emulation Service Circuit Pack)
3
e. Error Type 257: Control Channel Loop Test #52 failed. The circuit pack is
not properly connected with the control channel on the TDM bus.
1. Take the corrective action specified by Test #52?.
f. Error Type 513: ATM Crosstalk Test (#1298) failed. The board is writing to
or reading from a TDM time slot that is not allocated to the board, or the
Digital Signal Processor (DSP) selected for this test has malfunctioned.
1. Run
test board UUCSS
.
2. Take the corrective action specified for Test #1298.
g. Error Type 769, 770: the ATM switch is requesting too many LAPD
retransmissions (off-board ATM cell corruption errors).
1. Check the connections between the fiber cable, the ATM-TRK
circuit pack, and the ATM switch.
2. See the PKT-BUS for test and corrective procedures (Aux Data 35
only).
3. Determine what type of fiber is installed between the ATM-TRK
circuit pack and the ATM switch.
Error
Type
Aux
Data Description
769 35 LAPD excessive retransmission requests
770 25 ATM uncorrectable cell headers - threshold
If Then
There is multimode fiber Check the length of the fiber. If the cable
is longer than 2 km, it is probably causing
the errors.
There is single-mode fiber
or the length of the
multimode fiber is less
than 2 km
The source of the errors may lie in the
ATM facility, the ATM-TRK circuit pack, or
the far-end circuit pack.